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only consider valid & loaded url previews for show N more prompt

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This commit is contained in:
Michael Telatynski 2021-07-10 19:41:50 +01:00
parent 829169ec87
commit e3e7d41d5c
2 changed files with 29 additions and 42 deletions
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34
src/components/views/rooms/LinkPreviewGroup.tsx
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@ -14,43 +14,57 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
import React, { useEffect } from "react";
import React, { useContext, useEffect } from "react";
import { MatrixEvent } from "matrix-js-sdk/src/models/event";
import { IPreviewUrlResponse } from "matrix-js-sdk/src/client";
import { useStateToggle } from "../../../hooks/useStateToggle";
import LinkPreviewWidget from "./LinkPreviewWidget";
import AccessibleButton from "../elements/AccessibleButton";
import { _t } from "../../../languageHandler";
import MatrixClientContext from "../../../contexts/MatrixClientContext";
import { useAsyncMemo } from "../../../hooks/useAsyncMemo";
const INITIAL_NUM_PREVIEWS = 2;
interface IProps {
links: string[]; // the URLs to be previewed
mxEvent: MatrixEvent; // the Event associated with the preview
onCancelClick?(): void; // called when the preview's cancel ('hide') button is clicked
onHeightChanged?(): void; // called when the preview's contents has loaded
onCancelClick(): void; // called when the preview's cancel ('hide') button is clicked
onHeightChanged(): void; // called when the preview's contents has loaded
}
const LinkPreviewGroup: React.FC<IProps> = ({ links, mxEvent, onCancelClick, onHeightChanged }) => {
const cli = useContext(MatrixClientContext);
const [expanded, toggleExpanded] = useStateToggle();
const ts = mxEvent.getTs();
const previews = useAsyncMemo<[string, IPreviewUrlResponse][]>(async () => {
return Promise.all<[string, IPreviewUrlResponse] | void>(links.map(link => {
return cli.getUrlPreview(link, ts).then(preview => [link, preview], error => {
console.error("Failed to get URL preview: " + error);
});
})).then(a => a.filter(Boolean)) as Promise<[string, IPreviewUrlResponse][]>;
}, [links, ts], []);
useEffect(() => {
onHeightChanged();
}, [onHeightChanged, expanded]);
}, [onHeightChanged, expanded, previews]);
const shownLinks = expanded ? links : links.slice(0, INITIAL_NUM_PREVIEWS);
const showPreviews = expanded ? previews : previews.slice(0, INITIAL_NUM_PREVIEWS);
let toggleButton;
if (links.length > INITIAL_NUM_PREVIEWS) {
let toggleButton: JSX.Element;
if (previews.length > INITIAL_NUM_PREVIEWS) {
toggleButton = <AccessibleButton onClick={toggleExpanded}>
{ expanded
? _t("Collapse")
: _t("Show %(count)s other previews", { count: links.length - shownLinks.length }) }
: _t("Show %(count)s other previews", { count: previews.length - showPreviews.length }) }
</AccessibleButton>;
}
return <div className="mx_LinkPreviewGroup">
{ shownLinks.map((link, i) => (
<LinkPreviewWidget key={link} link={link} mxEvent={mxEvent} onHeightChanged={onHeightChanged}>
{ showPreviews.map(([link, preview], i) => (
<LinkPreviewWidget key={link} link={link} preview={preview} mxEvent={mxEvent}>
{ i === 0 ? (
<AccessibleButton
className="mx_LinkPreviewGroup_hide"